How about motorcycle cams/valves at 14-15k rpm.
Cool to see the oil squirting at low rpm and then turn into just a mist of oil at high rpm. Not to mention the springs/valves rotating around their axis at high rpm. Fascinating video here:
Cool to see the oil squirting at low rpm and then turn into just a mist of oil at high rpm. Not to mention the springs/valves rotating around their axis at high rpm. Fascinating video here: